
jQuery.extend({
    createUploadIframe: function(id, uri)
	{
			//create frame
            var frameId = 'jUploadFrame' + id;
            var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
			if(window.ActiveXObject)
			{
                if(typeof uri== 'boolean'){
					iframeHtml += ' src="' + 'javascript:false' + '"';

                }
                else if(typeof uri== 'string'){
					iframeHtml += ' src="' + uri + '"';

                }	
			}
			iframeHtml += ' />';
			jQuery(iframeHtml).appendTo(document.body);

            return jQuery('#' + frameId).get(0);			
    },
    createUploadForm: function(id, fileElementId, data)
	{
		//create form	
		var formId = 'jUploadForm' + id;
		var fileId = 'jUploadFile' + id;
		var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');	
		if(data)
		{
			for(var i in data)
			{
				jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
			}			
		}		
		var oldElement = jQuery('#' + fileElementId);
		var newElement = jQuery(oldElement).clone();
		jQuery(oldElement).attr('id', fileId);
		jQuery(oldElement).before(newElement);
		jQuery(oldElement).appendTo(form);
		
		//set attributes
		jQuery(form).css('position', 'absolute');
		jQuery(form).css('top', '-1200px');
		jQuery(form).css('left', '-1200px');
		jQuery(form).appendTo('body');		
		return form;
    },

    ajaxFileUpload: function(s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout		
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = new Date().getTime()        
		var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data));
		var io = jQuery.createUploadIframe(id, s.secureuri);
		var frameId = 'jUploadFrame' + id;
		var formId = 'jUploadForm' + id;		
        // Watch for a new set of requests
        if ( s.global && ! jQuery.active++ )
		{
			jQuery.event.trigger( "ajaxStart" );
		}            
        var requestDone = false;
        // Create the request object
        var xml = {}   
        if ( s.global )
            jQuery.event.trigger("ajaxSend", [xml, s]);
        // Wait for a response to come back
        
        var uploadCallback = function(isTimeout) { 
            var io = document.getElementById(frameId); 
            var execontent = function(){ 
              try { 
                if (io.contentWindow) { 
                  xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML: null; 
                  xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument: io.contentWindow.document; 
                } else if (io.contentDocument) { 
                  xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML: null; 
                  xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument: io.contentDocument.document; 
                } 
              } catch(e) { 
                handleError(s, xml, null, e); 
              } 
              if (xml || isTimeout == "timeout") { 
                requestDone = true; 
                var status; 
                try { 
                  status = isTimeout != "timeout" ? "success": "error"; 
                  // Make sure that the request was successful or notmodified 
                  if (status != "error") { 
                    // process the data (runs the xml through httpData regardless of callback) 
                    var data = jQuery.uploadHttpData(xml, s.dataType); 
                    // If a local callback was specified, fire it and pass it the data 
                    if (s.success) s.success(data, status); 
                    // Fire the global callback 
                    if (s.global) jQuery.event.trigger("ajaxSuccess", [xml, s]); 
                  } else handleError(s, xml, status); 
                } catch(e) { 
                  status = "error"; 
                  handleError(s, xml, status, e); 
                } 
                // The request was completed 
                if (s.global) jQuery.event.trigger("ajaxComplete", [xml, s]); 
                // Handle the global AJAX counter 
                if (s.global && !--jQuery.active) jQuery.event.trigger("ajaxStop"); 
                // Process result 
                if (s.complete) s.complete(xml, status); 
                jQuery(io).unbind(); 
                setTimeout(function() { 
                  try { 
                    jQuery(io).remove(); 
                    jQuery(form).remove(); 
                  } catch(e) { 
                    handleError(s, xml, null, e); 
                  } 
                }, 
                100); 
                xml = null; 
              } 
            }; 
            var crossdomain = !jQuery.browser.msie || document.domain == location.hostname; 
            if(!crossdomain) { 
              io.src="javascript:try{" 
                +"document.domain=window.location.hostname.split('.').reverse().slice(0,2).reverse().join('.');" 
                +"parent.document.getElementById('"+ frameId +"').setAttribute('uploaded','uploaded');" 
                +"}catch(e){}"; 
              var timer = window.setInterval(function(){ 
                try{ 
                  if(io.getAttribute("uploaded") == "uploaded") { 
                    crossdomain = true; 
                    window.clearInterval(timer); 
                    execontent(); 
                  } 
                }catch(e){} 
              },1000); 
            } else { 
              execontent(); 
            } 
          };
          
          
//        var uploadCallback = function(isTimeout)
//		{			
//			var io = document.getElementById(frameId);
//            try 
//			{		
//				if(io.contentWindow)
//				{
//					 xml.responseText = $(io).contents().text();
////					 xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
//					 xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
//					 
//				}else if(io.contentDocument)
//				{
//					 xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
//                	 xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
//				}	
//            }catch(e)
//			{
//            	console.log(e);
//				jQuery.handleError(s, xml, null, e);
//			}
//            if ( xml || isTimeout == "timeout") 
//			{		
//                requestDone = true;
//                var status;
//                try {
//                    status = isTimeout != "timeout" ? "success" : "error";
//                    // Make sure that the request was successful or notmodified
//                    if ( status != "error" )
//					{
//                        // process the data (runs the xml through httpData regardless of callback)
//                        var data = jQuery.uploadHttpData( xml, s.dataType );   
//                        // If a local callback was specified, fire it and pass it the data
//                        if ( s.success )
//                            s.success( data, status );
//    
//                        // Fire the global callback
//                        if( s.global )
//                            jQuery.event.trigger( "ajaxSuccess", [xml, s] );
//                    } else
//                        jQuery.handleError(s, xml, status);
//                } catch(e) 
//				{
//                    status = "error";
//                    jQuery.handleError(s, xml, status, e);
//                }
//
//                // The request was completed
//                if( s.global )
//                    jQuery.event.trigger( "ajaxComplete", [xml, s] );
//
//                // Handle the global AJAX counter
//                if ( s.global && ! --jQuery.active )
//                    jQuery.event.trigger( "ajaxStop" );
//
//                // Process result
//                if ( s.complete )
//                    s.complete(xml, status);
//
//                jQuery(io).unbind()
//
//                setTimeout(function()
//									{	try 
//										{
//											jQuery(io).remove();
//											jQuery(form).remove();	
//											
//										} catch(e) 
//										{
//											jQuery.handleError(s, xml, null, e);
//										}									
//
//									}, 100)
//
//                xml = null
//
//            }
//        }
        
        
        // Timeout checker
        if ( s.timeout > 0 ) 
		{
            setTimeout(function(){
                // Check to see if the request is still happening
                if( !requestDone ) uploadCallback( "timeout" );
            }, s.timeout);
        }
        try 
		{

			var form = jQuery('#' + formId);
			jQuery(form).attr('action', s.url);
			jQuery(form).attr('method', 'POST');
			jQuery(form).attr('target', frameId);
            if(form.encoding)
			{
				jQuery(form).attr('encoding', 'multipart/form-data');      			
            }
            else
			{	
				jQuery(form).attr('enctype', 'multipart/form-data');			
            }			
            jQuery(form).submit();

        } catch(e) 
		{			
            jQuery.handleError(s, xml, null, e);
        }
		
		jQuery('#' + frameId).load(uploadCallback	);
        return {abort: function () {}};	

    },

    uploadHttpData: function( r, type ) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        // If the type is "script", eval it in global context
        if ( type == "script" )
            jQuery.globalEval( data );
        // Get the JavaScript object, if JSON is used.
        if ( type === "json" ){
        	eval( "data = " + data );
        }
        // evaluate scripts within html
        if ( type == "html" )
            jQuery("<div>").html(data).evalScripts();

        return data;
    }
})

